1. Harvard Medical School, Boston, Massachusetts, USA.
2. Department of Psychosocial Oncology and Palliative Care, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.
3. Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
4. Division of Palliative Medicine, Department of Medicine, University of California San Francisco, San Francisco, USA.
5. Division of Community Internal Medicine, Geriatrics, and Palliative Care, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA.
6. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
7. Center for Palliative and Supportive Care, Division of Gerontology, Geriatrics, and Palliative Care, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
8. Department of Neurology and Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA.
9. Section of Palliative Medicine, Department of Medicine, Penn State University College of Medicine, Hershey, Pennsylvania, USA.
10. Division of Digestive Diseases, David Geffen School of Medicine, University of California, Los Angeles, California, USA.
11. VA Greater Los Angeles Healthcare System, Los Angeles, California, USA.
12. Department of Psychiatry and Behavioral Sciences, Memorial Sloan Kettering Cancer Center, New York, New York, USA.